Clemson University Tests:

Tests were carried out in cooperation with the Department of Civil Engineering, Clemson University, SC, in order to validate the computer program PANEL. This program calculates the response of a general panelized component under simultaneous vertical, side (racking) or transverse load (as applied by wind forces), taking into account  second-order effects (P-Delta). The test consisted of loading two types of wall panels under simultaneous vertical and side loads (applied by means of air bags), measuring the deformation and the corresponding loads. The panels were sheathed on both sides with Oriented Strand Board sheets, and had lumber ribs with depths of either 89mm or 140mm. Each type of wall was loaded vertically with either 14.6 kN/m or 29.2 kN/m. Transverse loads were applied to produce deflections of up to L/180, where L is the height of the wall. The tests showed that PANEL can accurately predict the deformation of the component.

     
These tests were completed in July, 2000, and a data and analysis report has been written:
Stefanescu, M. "Behavior of Wood Walls Under Combined Vertical and Out-of-Plane (Transverse) Loading Conditions", Report, Civil Engineering Department, University of British Columbia, Vancouver, B.C.